EP1414361B1 - Hautbehandlungsvorrichtung mit strahlungskalkulator - Google Patents

Hautbehandlungsvorrichtung mit strahlungskalkulator Download PDF

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Publication number
EP1414361B1
EP1414361B1 EP02741092.7A EP02741092A EP1414361B1 EP 1414361 B1 EP1414361 B1 EP 1414361B1 EP 02741092 A EP02741092 A EP 02741092A EP 1414361 B1 EP1414361 B1 EP 1414361B1
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Prior art keywords
hair
skin
processor
thickness
color
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EP02741092.7A
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English (en)
French (fr)
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EP1414361A1 (de
Inventor
Abraham J. Cense
Xiang S. Cheng
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Koninklijke Philips NV
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Koninklijke Philips NV
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
    • A61B18/203—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser applying laser energy to the outside of the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00017—Electrical control of surgical instruments
    • A61B2017/00022—Sensing or detecting at the treatment site
    • A61B2017/00057—Light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
    • A61B2018/00452—Skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
    • A61B2018/00452—Skin
    • A61B2018/00476—Hair follicles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00904—Automatic detection of target tissue

Definitions

  • the invention relates to a device for treating skin by means of radiation pulses, which device comprises a housing, a radiation source, a control unit for controlling the radiation source, and a detector for detecting an image of at least a part of the skin, said control unit comprising a processor which, in operation, determines from the image detected by the detector a dimension of a target object to be treated on the skin and which determines from said dimension a pulse dose of the radiation source that is necessary to treat said target obj ect.
  • a device of the type mentioned in the opening paragraph is known from EP-A-1 031 324 .
  • the known device is an epilation device.
  • the radiation source used in the known device is a laser source whose wavelength is readily absorbed by melanin, which is a pigment that is present in large concentrations in hairs and hair roots.
  • the device further comprises a laser beam manipulator that is equipped with a number of tiltable mirrors by means of which, in operation, a laser beam generated by the laser source is positioned in a target position on the skin to be treated.
  • the detector used in the known device comprises a heat image sensor.
  • the skin prior to the epilation process, the skin is exposed to a diffuse laser beam having a comparatively low dose, after which a heat image of the irradiated skin is detected by means of the detector.
  • a heat image of the irradiated skin is detected by means of the detector.
  • the processor controls the laser beam manipulator in such a manner that the laser beam is present successively in the positions of the hair roots thus determined, the laser source being activated in each one of said positions by the control unit so as to generate a radiation pulse having a comparatively high pulse dose.
  • the pulse dose necessary to destroy a hair root is determined by the control unit for each individual hair root from the thickness of the relevant individual hair root determined from the heat image.
  • the processor determines the necessary pulse dose for each individual hair root, in this known epilation device the total amount of radiation energy from the laser source that is necessary to remove all hairs is limited, and pulse doses that are too high leading to unnecessary skin irritations or even skin injuries and to an unnecessarily high energy consumption of the epilation device are precluded as much as possible.
  • EP 1 285 600 A1 which is considered as comprised in the state of the art pursuant to Article 54(3) EPC, discloses an apparatus for laser depilation comprising a semiconductor laser diode having a pulsating power output and a radiation period that can be determined by the user by using an input console. The pulsating energy output and the radiation period are controlled depending on the color and thickness of hairs to be depilated.
  • EP 1 166 723 A2 which is considered as comprised in the state of the art pursuant to Article 54(3) EPC, discloses a laser treatment apparatus for depilation of hairs on human skin that includes hair detection means for detecting a thickness of a hair and skin color detection means including imaging means for taking a picture image of the skin to be irradiated and image processing means for detecting a color of the imaged skin.
  • the apparatus comprises control means that automatically determines an irradiation condition based on data on the skin color and hair thickness that are detected.
  • a drawback of the known device resides in that the pulse doses from the laser source that are necessary to destroy individual hair roots are often insufficiently accurately determined by the processor. As a result, in many cases too low a pulse dose is applied so that a hair root is not, or only partly, destroyed and the result of the epilation operation is insufficient, or ,conversely, the pulse dose applied is too high, as a result of which the hair root is destroyed but also part of the skin tissue around the hair root is adversely affected, thereby causing skin irritations.
  • a device of the type mentioned in the opening paragraph is characterized in accordance with the invention in that the processor also determines from the detected image a color of the target object to be treated, the processor determining the necessary pulse dose from said dimension and said color. It has been found that in many cases the pulse dose that is necessary to treat a target object present on or in the skin depends not only on the dimension(s) of the target object but is predominantly determined by said dimension(s) and by the absorption coefficient of the target object for the radiation generated by the radiation source. The necessary pulse dose is generally lower as said absorption coefficient is higher. It has been found that in many cases, such as in the case of hairs and blood vessels, said absorption coefficient is strongly related to the color of the target object.
  • the processor determines from the detected image of the skin not only the dimension of each individual target object but also the color of each individual target object, said processor is capable of additionally determining, for example by means of a previously empirically determined relationship between the color and the absorption coefficient of target objects of the type to be treated, the absorption coefficient of each individual target object by means of the detected image. In this manner, the absorption coefficient of each individual target object is determined in a particularly efficient and practical way.
  • the processor determines the necessary pulse dose from said dimension and said color that is related to the absorption coefficient, the pulse dose necessary to treat each individual target object is accurately determined, so that pulse doses that are too high or too low are more effectively precluded.
  • a particular embodiment of a device in accordance with the invention is characterized in that the radiation source comprises a laser source and the device is provided with a laser beam manipulator that can be controlled by the control unit, which laser beam manipulator is used to position a laser beam supplied by the laser source in a target position on the skin, the processor determining from the detected image also a position and/or orientation on the skin of the target obj ect and said processor determining the target position from said position and/or orientation, and the control unit activating the laser source if the laser beam manipulator is in a position that corresponds to the target position.
  • the laser source is activated as described above by the control unit if the laser beam manipulator is in a position that corresponds to the target position of the laser beam, determination of the target position and activation of the laser source in the target position occur fully automatically, so that the device is safe for use by inexperienced persons and in particular suitable for the consumer market.
  • the control unit comprises for example an algorithm which is suitable for this purpose, and by means of which the position and/or orientation of the target object to be treated on or in the skin can be determined on the basis of the image information, and by means of which the target position can be determined on the basis of said position and/or orientation of the target object In this manner, by means of the detected image, the dimension and the color of the target object to be treated as well as the target position of the laser beam on the skin is determined, so that the detector is used in a practical and efficient manner.
  • a further embodiment of a device in accordance with the invention is characterized in that the detector comprises a CCD image sensor or a CMOS image sensor. Said detectors have comparatively small dimensions and are very accurate.
  • the CMOS image sensor has the additional advantage that the electronics necessary to read and interpret the detected image can be integrated in the image sensor, thus leading to a simplification of the structure of the device.
  • Yet another embodiment of a device in accordance with the invention is characterized in that the processor determines the color of the target object to be treated from a gray value that the target object has in the image of the skin detected by means of the image sensor.
  • the processor determines the color of the target object to be treated from a gray value that the target object has in the image of the skin detected by means of the image sensor.
  • the detected image comprises a comparatively simple gray scale distribution. It has been found that in most cases satisfactory results are achieved by using such a simple image sensor.
  • a particular embodiment of a device in accordance with the invention is characterized in that the device is a hair removing device, wherein the processor determines from the detected image a thickness and a color of a hair to be removed, and the detector determines from said thickness and color a pulse dose that is necessary to remove said hair.
  • the invention becomes effectual in a particular way because the absorption coefficient of hairs for the radiation of the radiation source depends substantially on the color of the hairs.
  • a laser source having a wavelength that is absorbed well by melanin, which is a natural pigment present in hairs.
  • a further embodiment of a device in accordance with the invention is characterized in that the device is a shaver, wherein the processor determines the thickness and the color of a hair to be cut close to a position on the hair where the hair projects from the skin. It has been found that the pulse dose that is necessary to cut a hair near the surface of the skin depends mainly on the thickness of the hair near the surface of the skin and on the absorption coefficient/color of the hair. As the processor determines the thickness and the color of the individual hairs in said position near the surface of the skin, the necessary pulse dose for each individual hair is determined in an accurate and reliable manner. As a result, the shaving performance of the device in this embodiment is satisfactory, and skin irritations are limited as much as possible.
  • a still further embodiment of a device in accordance with the invention is characterized in that the device is an epilation device, wherein the processor determines a thickness of the hair root from the thickness of the hair by means of a predetermined relationship between hair thickness and hair root thickness, and wherein the processor determines the necessary pulse dose from the color and from the hair root thickness thus determined. It has been found that the pulse dose that is necessary to destroy a hair root depends mainly on the thickness of the hair root and on the absorption coefficient/color of the hair.
  • the thickness of each individual hair root is determined in a practical and reliable manner by the processor from the thickness of the visible portion of the relevant hair, so that the necessary pulse dose for destroying each individual hair is determined also in an accurate and reliable manner by the processor.
  • the epilation performance of the device in this embodiment is satisfactory, and skin irritations are limited as much as possible.
  • Fig. 1 diagrammatically shows a first embodiment of a device 1 in accordance with the invention for treating skin 3 by means of radiation pulses, said device being a hair removing device, in particular a laser epilation device, by means of which hairs 5 present on the skin 3 are removed for a comparatively long period of time, or permanently, by means of laser pulses.
  • Said device 1 comprises a housing 7 with a handle 9, so that the device 1 is portable and can be placed on or moved over skin 3 to be treated.
  • the housing 7 has a skin contact surface 11 via which the housing 7 is in contact with the skin 3 during operation.
  • the skin contact surface 11 is equipped with an exit opening 13.
  • the housing 7 accommodates a radiation source 15, which, in the embodiment shown, is a laser source such as a diode laser.
  • the radiation source 15 generates, in operation, a laser beam 17 having a frequency that is absorbed well by melanin, which is a natural pigment present in large concentrations in hairs.
  • a suitable wavelength lies in the range between for example 650 nm and 1200 nm.
  • the housing 7 further accommodates an adjustable laser beam manipulator 19 by means of which, in operation, the laser beam 17 can be positioned, via the exit opening 13, in a target position 21 on the skin 3.
  • the laser beam manipulator 19 is equipped with a first adjustable tilting mirror 23 and a second adjustable tilting mirror 25, which are both arranged at an angle of approximately 45° with respect to the skin contact surface 11.
  • the tilting mirrors 23 and 25 can be tilted about, respectively, a first tilt axis 31, which extends in the plane of the first tilting mirror 23 and is directed substantially parallel to the skin contact surface 11, and a second tilt axis 33, which extends in the plane of the second tilting mirror 25 and crosses the first tilt axis 31 substantially perpendicularly.
  • the target position 21 of the laser beam 17 can be displaced over the skin 3 in a direction parallel to an X-direction and a Y-direction extending perpendicularly thereto, both directions being parallel to the skin contact surface 11.
  • the housing 7 further accommodates a control unit 35 by means of which the actuators 27 and 29 and the radiation source 15 can be controlled in the following manner.
  • the control unit 35 receives, in operation, a signal u s that is supplied by a detector 37, i.e. a CMOS image sensor in the embodiment shown.
  • the detector 37 Prior to the epilation process, the detector 37 detects an image of the part of the skin 3 that is situated in front of the exit opening 13. To this end, said part of the skin 3 is exposed by means of an illumination member 39 that is also accommodated in the housing 7 and that supplies a light beam 41 via a transparent plate 43 that is provided with a reflective surface 45 on a side facing the exit opening 13.
  • the control unit 35 is equipped with a first processor 47 which determines from the signal u s , i.e. from the image of the skin 3 detected by the detector 37, the positions of the hair roots 49 of the hairs 5' present on the relevant part of the skin. Subsequently, the first processor 47 controls the actuators 27 and 29 by means of, respectively, a signal u M1 and a signal u M2 in such a manner that the laser beam 17 is successively positioned in a series of target positions 21 that correspond to the positions of the hair roots 49 determined by the first processor 47.
  • the radiation source 15 is activated by the first processor 47 by means of a signal u L so as to generate a laser pulse with a pulse dose that is determined in a manner that will be described hereinbelow by a second processor 51 of the control unit 35.
  • the pulse dose is so high that the relevant hair root dies.
  • the pulse dose of the laser beam 17 is determined individually for each hair root 49 by the second processor 51 of the control unit 35. It has been found that the pulse dose that is necessary to cause a hair root to be destroyed and die depends predominantly on the thickness of said hair root and on the absorption coefficient of the hair for the laser light supplied by the laser source 15. The necessary pulse dose is higher as said thickness is greater, and the necessary pulse dose is lower as said absorption coefficient is higher. As said absorption coefficient is predominantly determined by the concentration of melanin in a hair, and the color of a hair is predominantly determined by said concentration, hairs demonstrate a strong relationship between the color and said absorption coefficient. Dark hairs have a comparatively high concentration of melanin, so that the necessary pulse dose for dark hairs is comparatively low.
  • the second processor 51 determines the pulse dose.
  • the second processor 51 receives the signal u s that corresponds to the image of the skin 3 detected by the detector 37.
  • the signal u s comprises a series of 8-bit gray values of the pixels of the detector 37.
  • Fig. 2 diagrammatically shows a sub-region 53 of the image detected by the detector 37, which sub-region comprises a hair 5'.
  • the second processor 51 determines a gray-value distribution of the detected image, from which the second processor 51 determines the thickness t H for each individual hair 5' present in the image and, by means of a predetermined relationship between the color of the hair and the gray value of hairs in such an image, the color.
  • the thickness of each individual hair 5' which is determined as described above, is used by the second processor 51 to determine the thickness t R of the hair root 49 of the relevant hair 5' by means of a previously empirically established relationship between the hair thickness and the hair root thickness. As hairs demonstrate a strong relationship between the hair thickness and the hair root thickness, the thickness of the hair root 49 is reliably determined in this manner by the second processor 51 from the thickness of the visible part of the hair 5'.
  • the thus determined thickness of the hair root 49 and the color are used by the second processor 51 to subsequently determine, for each individual hair 5' present in the image, the necessary pulse dose from the radiation source 15 by means of a previously empirically established relationship between the pulse dose, the hair root thickness and the color of the hair.
  • the necessary pulse dose depends strongly on the hair root thickness as well as the color of the hair, the pulse doses necessary to destroy the hair roots 49 are accurately and reliably determined in this way.
  • the control unit 3 5 activates the laser source 15 in each target position 21 determined by means of the first processor 47, the pulse dose being determined, as described above, by the second processor 51 for the hair root 49 present in the relevant target position 21.
  • the total amount of radiation energy needed by the device 1 to treat all hair roots 49 is smaller that the total amount of radiation energy needed by a conventional laser epilation device whose pulse dose has a constant value that is so high that statistically the commonest hair root types are destroyed.
  • the control unit 35 determines the necessary pulse dose from the radiation source 15 for each individual hair root 49, it is precluded, on the one hand, that the relevant hair root 49 is exposed to too high a pulse dose, as a result of which not only the hair root 49 would be affected but also the surrounding skin tissue, which could lead to skin irritations, and, on the other hand, it is precluded that the relevant hair root 49 is exposed to too low a pulse dose, as a result of which the hair root would not be destroyed completely and the epilation result could not be optimal.
  • the epilation device 1 in accordance with the invention yields comparatively good epilation results, while causing no, or comparatively few, skin irritations.
  • the control unit 35 derives not only the positions of the hair roots 49 that are necessary to determine the target positions 21 of the laser beam manipulator 19 from the image of the skin 3 detected by the detector 37, but also the thickness and color of each hair 5' that are necessary to determine the necessary pulse doses, the detector 37 is efficiently used.
  • the detector 37 comprises a comparatively simple and inexpensive CMOS image sensor, and the detected image has a comparatively simple gray-value distribution of the skin 3. It has been found that the results achieved by such an image sensor are mostly satisfactory.
  • the reliability with which the absorption coefficient-related color of the hairs 5' can be determined from the gray-value distribution increases considerably if the light from the illumination member 39, to which the skin is exposed, has a wavelength that corresponds to the wavelength of the radiation source 15.
  • a CMOS image sensor has the additional advantage that the electronics necessary to read and interpret the detected image can be integrated in the image sensor.
  • the control unit 35 can be integrated partly, or even bodily, with the detector 37, resulting in a substantial simplification of the structure of the device 1.
  • the invention also comprises embodiments wherein the device is equipped with a different type of detector for detecting an image of the skin.
  • the detector may comprise a CCD image sensor instead of a CMOS image sensor.
  • the invention also comprises embodiments wherein the detector comprises a heat image sensor, as is the case in the epilation device known from EP-A-1 031 324 .
  • the control unit of the device is adapted in a manner that is known per se so as to enable reading and interpreting the image of the skin detected by means of the alternative detector used.
  • Fig. 3 diagrammatically shows the second embodiment of a device 1' in accordance with the invention for treating skin 3 by means of radiation pulses, said device also being a hair removing device, in particular a laser shaving device, by means of which hairs 5 present on the skin 3 are cut close to the surface of the skin.
  • a hair removing device in particular a laser shaving device
  • parts of the device 1' corresponding to parts of the device 1 described hereinabove are indicated by means of corresponding reference numerals.
  • reference numerals hereinbelow only the most important differences between the device 1' and the device 1 are discussed.
  • the device 1' differs mainly from the device 1 in that the first processor 47' of the control unit 35' employed in the device 1' determines the target positions 21' of the laser beam 17 in a different manner and in that the second processor 51' of the control unit 35' determines the necessary pulse doses of the radiation source 15 in a different manner.
  • Fig. 4 diagrammatically shows a sub-region 53' of the image detected by the detector 37, wherein a hair 5' is present.
  • the first processor 47' determines, from the gray-value distribution of the detected image, a position 55 on the hair 5' where said hair 5' projects from the skin 3.
  • the first processor 47' determines the position 55 it makes a distinction between the position 55 and the end 57 of the hair 5' by means of previously determined gray-value characteristics and form characteristics of hair-emergence positions and hair ends that are stored in the memory of the first processor 47'.
  • the first processor 47' thus determines the relevant position 55 for each hair present in the image.
  • the first processor 47' controls the actuators 27 and 29 by means of, respectively, the signals u M1 and u M2 in such a manner that the laser beam 17 is successively positioned in a series of target positions 21' that correspond to positions on the hairs 5' close to the positions 55 thus determined by the second processor 47'.
  • the radiation source 15 is activated by the first processor 47' by means of the signal u L to generate a laser pulse having a pulse dose that is determined by the second processor 51' in a manner that will be described in more detail hereinbelow.
  • the pulse dose is so high that the relevant hair 5' is cut close to the position 55, i.e. near the surface of the skin.
  • the device 1' can be provided with an adjusting member enabling the user to set the location of the target positions 21' with respect to the surface of the skin 3.
  • Said adjusting member enables the user, for example, to set a location of the target positions 21' at skin surface level or even below the surface of the skin 3, so that a very smooth shaving result is obtained, or a location just above the surface of the skin 3 or even at some distance above the surface of the skin 3, so that during shaving a predetermined length of the hairs 5' above the surface of the skin 3 is maintained.
  • the desired smoothness can be obtained by setting said adjusting member.
  • the pulse dose that is necessary to cut the hairs 5, 5' by means of the laser beam 17 is much lower than the pulse dose that is necessary to destroy the hair roots 49 in the device 1 described hereinabove.
  • the necessary power from the radiation source 15 of the device 1' is much smaller that the necessary power from the radiation source 15 of the device 1.
  • the pulse dose of the laser beam 17 that is necessary to cut an individual hair 5' close to the surface of the skin 3 depends substantially on the thickness of the relevant hair 5' and on the absorption coefficient of the hair 5' for the laser light supplied by the radiation source 15, said absorption coefficient being strongly related to the color of the hair 5'.
  • the second processor 51' determines, from the gray-value distribution of the image of the skin 3 detected by means of the detector 37, and by means of the predetermined gray-value characteristics and form characteristics of hair-emergence positions and hair ends that are stored in the memory of the first processor 47', for each individual hair 5' present in the image the thickness t' H and the color in the position 55 on the relevant hair 5' where said hair 5' emerges from the skin 3.
  • the thickness t' H and the color thus determined are used by the second processor 51' to subsequently determine, for each individual hair 5' present in the image, the necessary pulse dose from the radiation source 15 by means of a previously empirically established relationship between the pulse dose, the hair thickness and the hair color.
  • the necessary pulse dose depends substantially on the hair thickness as well as the hair color, the pulse doses that are necessary to cut the hairs 5' are particularly accurately and reliably determined in the manner described above.
  • the control unit 35' activates the laser source 15 in each target position 21' determined by means of the first processor 47', the pulse dose being determined, as described above, by the second processor 51' for the hair 5' present in the relevant target position 21'.
  • the above-discussed devices 1 and 1' are hair removing devices by means of which hair roots are destroyed or hairs are cut using a laser beam that is positioned in a target position on the hairs by means of a laser beam manipulator. It is noted that the invention also comprises other types of devices for treating other types of target objects present in or on the skin by means of radiation pulses. Examples of such devices are devices for the medical or cosmetic treatment by means of radiation pulses of birthmarks, such as naevus vinosus and naevus pigmentosus, present on the skin, psoriasis, or aberrations of blood vessels present in the skin, such as varicose veins.
  • the image of the skin detected by means of the detector is used to establish a pulse dose-determining dimension and the color/absorption coefficient of the target object to be treated, and the necessary pulse dose is subsequently determined from the dimension and color thus determined.
  • the thickness of the relevant blood vessels is the dimension that determines the pulse dose.
  • the invention also comprises devices for treating skin by means of radiation pulses which are equipped with a type of radiation source that differs from the laser source applied in the above-described devices 1 and 1'.
  • a type of radiation source that differs from the laser source applied in the above-described devices 1 and 1'.
  • Examples of such devices are flashlights, in which case the necessary pulse dose must also be determined from a characteristic dimension and color of the target object to be treated. If such a flashlight is used, the part of the skin present in front of the exit opening of the housing is completely irradiated by the flashlight, so that such a device does not require a radiation beam manipulator.
  • the pulse dose that is determined by the second processor 47, 47' of the devices 1, 1' is a minimum pulse dose necessary to destroy the hair roots 49 or cut the hairs 5, 5'.
  • a device in accordance with the invention can also be provided with a further processor that determines a maximum permissible pulse dose of the radiation source for the skin, for example, on the basis of a value or state of a biophysical property of the skin measured by means of a further detector.
  • a biophysical property of the skin enabling the maximum permissible pulse dose to be determined is, for example, the absorption coefficient, the scattering coefficient or the reflection coefficient of the skin for the radiation of the radiation source.
  • a minimum pulse dose necessary to treat the target object present in or on the skin is determined in this manner but also a maximum permissible pulse dose for the skin.
  • a device can be equipped, for example, with a protection that makes sure that the radiation source is not activated in situations where the minimum pulse dose thus determined exceeds the maximum permissible pulse dose.

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Claims (7)

  1. Vorrichtung (1, 1') zur Behandlung der Haut (3) mittels Strahlungspulsen, wobei die Vorrichtung ein Gehäuse (7), eine Strahlenquelle (15), eine Steuereinheit (35, 35') zur Steuerung der Strahlenquelle und einen Detektor (37) zur Erkennung eines Bildes zumindest eines Teils der Haut umfasst, wobei die genannte Steuereinheit einen Prozessor (51, 51') umfasst, der im Betrieb aus dem von dem Detektor erkannten Bild ein Maß (tR, t'H) eines auf der Haut zu behandelnden Zielobjekts (49, 55) ermittelt und auf der Grundlage des genannten Maßes eine Pulsdosis der Strahlenquelle ermittelt, die für die Behandlung des genannten Zielobjekts erforderlich ist,
    dadurch gekennzeichnet, dass der Prozessor (51, 51') aus dem erkannten Bild außerdem eine Farbe des zu behandelnden Zielobjekts (49, 55) ermittelt, wobei der Prozessor die erforderliche Pulsdosis auf der Grundlage des genannten Maßes (tR, t'H) und der genannten Farbe ermittelt.
  2. Vorrichtung (1, 1') nach Anspruch 1,
    dadurch gekennzeichnet, dass die Strahlenquelle (15) eine Laserquelle umfasst und die Vorrichtung mit einer Laserstrahl-Führungseinheit (19) ausgestattet ist, der durch die Steuereinheit (35, 35') gesteuert werden kann, wobei die Laserstrahl-Führungseinheit dazu verwendet wird, einen von der Laserquelle gelieferten Laserstrahl (17) auf eine Zielposition (21, 21') auf der Haut (3) zu lenken, wobei der Prozessor (47, 47') aus dem erkannten Bild auch eine Position und/oder Ausrichtung der Zielobjekts (49, 55) auf der Haut ermittelt und der genannte Prozessor die Zielposition auf der Grundlage der genannten Position und/oder Ausrichtung ermittelt und die Steuereinheit die Laserquelle aktiviert, wenn sich die Laserstrahl-Führungseinheit an einer Position befindet, die der Zielposition entspricht.
  3. Vorrichtung (1, 1') nach Anspruch 1,
    dadurch gekennzeichnet, dass der Detektor (37) einen CCD-Bildsensor oder einen CMOS-Bildsensor umfasst.
  4. Vorrichtung (1, 1') nach Anspruch 3,
    dadurch gekennzeichnet, dass der Prozessor (51, 51') die Farbe des zu behandelnden Zielobjekts (49, 55) aus einem Grauwert ermittelt, den das Zielobjekt (3) in dem mittels des Bildsensors erkannten Bildes der Haut aufweist.
  5. Vorrichtung (1, 1') nach Anspruch 1,
    dadurch gekennzeichnet, dass die Vorrichtung (1, 1') ein Haarentferner ist, wobei der Prozessor (51, 51') aus dem erkannten Bild eine Dicke (tH, t'H) und eine Farbe eines zu entfernenden Haares ermittelt und der Prozessor auf der Grundlage der genannten Dicke und Farbe eine Pulsdosis ermittelt, die für die Entfernung des genannten Haares erforderlich ist.
  6. Vorrichtung (1') nach Anspruch 5,
    dadurch gekennzeichnet, dass die Vorrichtung (1') ein Rasierer ist, wobei der Prozessor (51') die Dicke (tH) und die Farbe eines zu schneidenden Haares (5') nahe einer Position an dem Haar ermittelt, an der das Haar aus der Haut (3) ragt.
  7. Vorrichtung (1) nach Anspruch 5,
    dadurch gekennzeichnet, dass die Vorrichtung (1) ein Epiliergerät ist, wobei der Prozessor (51) eine Stärke (tR) der Haarwurzel (49) auf der Grundlage der Dicke (tH) des Haares (5) anhand eines vorbestimmten Verhältnisses zwischen Haardicke und Haarwurzelstärke ermittelt und wobei der Prozessor die erforderliche Pulsdosis auf der Grundlage der Farbe und der so ermittelten Haarwurzelstärke ermittelt.
EP02741092.7A 2001-07-27 2002-06-26 Hautbehandlungsvorrichtung mit strahlungskalkulator Expired - Lifetime EP1414361B1 (de)

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EP01202872 2001-07-27
EP01202872 2001-07-27
PCT/IB2002/002667 WO2003011159A1 (en) 2001-07-27 2002-06-26 Skin treating device comprising a processor for determination of the radiation pulse dose
EP02741092.7A EP1414361B1 (de) 2001-07-27 2002-06-26 Hautbehandlungsvorrichtung mit strahlungskalkulator

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US6706035B2 (en) 2004-03-16
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US20030023235A1 (en) 2003-01-30
JP2005500879A (ja) 2005-01-13
CN1476312A (zh) 2004-02-18

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